Liquid crystal display panel

ABSTRACT

A liquid crystal display panel including an array substrate, an opposite substrate disposed opposite to the array substrate and liquid crystal medium between the opposite substrate and the array substrate is provided. The array substrate includes a passivation layer, an insulation layer and a first electrode. The passivation layer has a contact hole. The insulation layer is disposed on the passivation layer and has a concave at a portion overlapped with the contact hole. The first electrode is disposed on the passivation layer and the insulation layer, and has a main portion and stripe portions, wherein a gap is formed between the two adjacent stripe portions. Each stripe portion has a connection portion, at least one turning point and an extending portion. Each connection portion is directly connected to the main portion, and the contact hole is overlapped with at least one connection portion.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of Taiwan applicationserial no. 103128631, filed on Aug. 20, 2014. The entirety of theabove-mentioned patent application is hereby incorporated by referenceherein and made a part of this specification.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a display panel, and particularly relates to aliquid crystal display panel.

2. Description of Related Art

As the development of liquid crystal display panels advances, highresolution has become one of the basic requirements. Generally speaking,since there are a great number of pixels in a high resolution liquidcrystal display panel, it is required to design a metal common line inthe panel to improve stability of a common voltage in the panel, so asto reduce flickers or image sticking in an image of the panel.Currently, the design of the metal common line is implemented bybridging an indium tin oxide common line to the metal common linethrough a contact hole. However, even though the design of adding themetal common line helps maintain the stability of the display image ofthe panel, the aperture ratio, liquid efficiency, and transmittance ratein the area where the contact hole is disposed in the panel are reduced,making dot mura in the display image occur more frequently. Thus, torealize high resolution display in the liquid display panel under thepremise of adding the metal common line, how to prevent reduction of theaperture rate, liquid crystal efficiency, and transmittance rate iscertainly an issue to be overcome.

SUMMARY OF THE INVENTION

The invention provides a liquid crystal display panel whose image doesnot have flickers, image sticking or dot mura. The display panel thushas a preferable display quality.

The liquid crystal display panel of the invention includes an arraysubstrate, an opposite substrate, and a liquid crystal medium. The arraysubstrate includes a passivation layer, a first insulation layer, and afirst electrode. The passivation layer has a first contact hole. Thefirst insulation layer is located on the passivation layer, wherein thefirst insulation layer has a concave at a portion overlapped with thefirst contact hole. The first electrode is located on the passivationlayer and the first insulation layer, and includes a main portion and aplurality of strip portions, wherein a gap is formed between twoadjacent strip portions. Each of the strip portions has a connectionportion, at least one turning point, and an extending portion, theturning point is located between the connection portion and theextending portion, each of the connection portions is directly connectedwith the main portion, and the first contact hole is overlapped with atleast one connection portion. The opposite substrate is disposedopposite to the array substrate. The liquid crystal medium is disposedbetween the array substrate and the opposite substrate.

Another liquid crystal display panel of the invention includes an arraysubstrate, an opposite substrate, and a liquid crystal medium. The arraysubstrate includes a passivation layer, a first insulation layer, and afirst electrode. The passivation layer has a first contact hole. Thefirst insulation layer is located on the passivation layer. The firstelectrode is located on the passivation layer and the first insulationlayer, and includes a main portion and a plurality of strip portions,wherein a gap is formed between two adjacent strip portions. Each of thestrip portions has a turning point, and an area between a connectionline of the turning points of the strip portions and the main portion isoverlapped with the first contact hole. The opposite substrate isdisposed opposite to the array substrate. The liquid crystal medium isdisposed between the array substrate and the opposite substrate.

Based on the above, in the liquid crystal display panel of theinvention, the first contact hole overlapped with at least oneconnection portion of the first electrode or overlapped with the areabetween the connection line of the turning points and the main portionof the first electrode is disposed in the pixel structures. With suchconfiguration, flickers, image sticking or dot mura in an image of theliquid crystal display panel is reduced, and the display panel thusprovides the preferable display quality.

In order to make the aforementioned and other features and advantages ofthe invention comprehensible, several exemplary embodiments accompaniedwith figures are described in detail below.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the invention, and are incorporated in and constitute apart of this specification. The drawings illustrate embodiments of theinvention and, together with the description, serve to explain theprinciples of the invention.

FIG. 1 is a schematic cross-sectional view illustrating a liquid crystaldisplay panel according to an embodiment of the invention.

FIG. 2 is a schematic top view of an array substrate in the liquidcrystal display panel of FIG. 1.

FIG. 3A is a schematic top view of a pixel structure 200 a of FIG. 2.

FIG. 3B is a schematic cross-sectional view along cross-sectional linesI-I′ and II-IP of FIG. 3A.

FIG. 4A is a schematic top view of a pixel structure 200 b of FIG. 2.

FIG. 4B is a schematic cross-sectional view along cross-sectional linesI-I′ and II-IP of FIG. 4A.

FIG. 5 is a schematic top view illustrating a pixel structure accordingto another embodiment of the invention.

FIG. 6A is a schematic top view illustrating a pixel structure accordingto another embodiment of the invention.

FIG. 6B is a schematic cross-sectional view along cross-sectional linesI-I′ and II-IP of FIG. 6A.

DESCRIPTION OF THE EMBODIMENTS

Reference will now be made in detail to the present preferredembodiments of the invention, examples of which are illustrated in theaccompanying drawings. Wherever possible, the same reference numbers areused in the drawings and the description to refer to the same elements.

FIG. 1 is a schematic cross-sectional view illustrating a liquid crystaldisplay panel according to an embodiment of the invention. FIG. 2 is aschematic top view of an array substrate in the liquid crystal displaypanel of FIG. 1. FIG. 3A is a schematic top view of a pixel structure200 a of FIG. 2. FIG. 3B is a schematic cross-sectional view alongcross-sectional lines I-I′ and II-II′ of FIG. 3A. FIG. 4A is a schematictop view of a pixel structure 200 b of FIG. 2. FIG. 4B is a schematiccross-sectional view along cross-sectional lines I-I′ and II-IP of FIG.4A.

Referring to FIG. 1, a liquid crystal display panel 100 includes anarray substrate 110, an opposite substrate 120, and a liquid crystalmedium 130. In this embodiment, the liquid crystal display panel 100 isa fringe field switching liquid crystal display panel, for example.

Referring to FIGS. 1 and 2 together, the array substrate 110 includes asubstrate 112 and a pixel array 114. The material of the substrate 112may be glass, quartz, an organic polymer, or metal, etc. The pixel array114 is disposed on the substrate 112, and the pixel array 114 includes aplurality of pixel structures 200 a and a plurality of pixel structures200 b. In addition, the pixel structures 200 a and 200 b are arrangedinto a plurality of lines and columns. Details with respect to thedesign of the pixel structures 200 a and 200 b will be described in thefollowing.

The opposite substrate 120 is disposed opposite to the array substrate110. The material of the opposite substrate 120 may be glass, quartz, oran organic polymer, etc. A color filter array layer (not shown) may befurther disposed on the opposite substrate 120, and the color filterarray layer includes red, green, and blue light filtering patterns. Inaddition, a light shielding pattern layer (not shown) may be furtherdisposed on the opposite substrate 120. The light shielding patternlayer is disposed between the patterns of the color filter array layerto block elements and wiring in the liquid crystal display panel 100that are supposed to be hidden from the user and to prevent lightleakage as well.

The liquid crystal medium 130 is located between the array substrate 110and the opposite substrate 120. In this embodiment, the liquid crystalmedium 130 is liquid crystal molecules, for example.

In the following, the pixel structures 200 a and 200 b are described indetails with reference to FIGS. 2, 3A, 3B, 4A, and 4B.

Referring to FIGS. 2, 3A, and 3B, the pixel structure 200 a includes ascan line SL, a data line DL, an active device T, a first electrode PE,a common line COM1, a second electrode COM2, a passivation layer PL, afirst insulation layer IL1 and a second insulation layer IL2.

Extending directions of the scan line SL and the data line DL aredifferent. Preferably, the extending direction of the scan line SL andthe extending direction of the data line DL are perpendicular to eachother. In addition, the scan line SL and the data line DL are located ondifferent layers, and there is an insulation layer (not shown) disposedbetween the two layers. The scan line SL and the data line DL areprimarily used to transmit a driving signal for driving the pixelstructure 200 a. In this embodiment, the material of the scan line SLand the data line DL is metal, for example.

The active device T is electrically connected with the scan line SL andthe data line DL. Here, the active device T is a thin film transistor,for example, and includes a gate GE, a channel layer CH, a drain DE, anda source SE.

In addition, there is a gate insulation layer GI between the gate GE,and the source SE and the drain DE. Moreover, the channel layer CH isdisposed between the gate insulation layer GI, and the source SE and thedrain DE. The gate GE and the scan line SL is a continuous conductivepattern, indicating that the gate GE and the scan line SL areelectrically connected to each other. Moreover, the source SE and thedata line DL is a continuous conductive pattern, indicating that thesource SE and the data line DL are electrically connected to each other.In other words, when a control signal is input to the scan line SL, thescan line SL and the gate GE are electrically conductive to each other,and when a control signal is input to the data line DL, the data line DLand the source SE are electrically conductive to each other.

Besides, another insulation layer PV may cover the active device T, andthe insulation layer PV may be deemed as a protection layer. In anexample, the thickness of the gate insulation layer GI is 0.4 μM, andthe thickness of the insulation layer PV is 0.1 μm. Here, the gateinsulation layer GI and the insulation layer PV form a second insulationlayer IL2.

In this embodiment, the active device T is described as a bottom-gatethin film transistor, for example. However, the invention is not limitedthereto. In other embodiments, the active device T may be a top-gatethin film transistor.

The common line COM1 intersects the data line DL, and is electricallyinsulated from the scan line SL and the data line DL. In thisembodiment, the common line COM1, the scan line SL, and the gate GE areformed by a same layer. In other words, the material of the common lineCOM1 is metal, for example. Viewing from another perspective, the secondinsulation layer IL2 covers the common line COM1, and the secondinsulation layer IL2 has a second contact hole H2 to expose a portion ofthe common line COM1. In other words, the gate insulation layer GI andthe insulation layer PV share the second contact hole H2.

The passivation layer PL is located on the second insulation layer IL2and covers the active device T and the common line COM1. The passivationlayer PL has a first contact hole H1. The first contact hole H1 and thesecond contact hole H2 are overlapped and connected with each other. Inother words, the first contact hole H1 also exposes a portion of thecommon line COM1. In this embodiment, the first contact hole H1 and thesecond contact hole H2 are in a concentric arrangement, as shown in FIG.3A. However, the invention is not limited to the illustration of FIG.3A, as long as the first contact hole H1 and the second contact hole H2are overlapped and connected with each other.

Besides, the thickness of the passivation layer PL is from 1.3 μm to 3μm, for example. In an example, the thickness of the passivation layerPL is 2 μm. It should be noted that since the passivation layer PL issignificantly thicker than the second insulation layer IL2, when thesecond insulation layer IL2 and the passivation layer PL are exposed,the time for a chemical etching treatment to the passivation layer PL islonger, and the opening of the first contact hole H1 is thussignificantly larger than the opening of the second contact hole H2. Inother words, the projection area of the first contact hole H1 is greaterthan the projection area of the second contact hole H2.

The second electrode COM2 is located on the passivation layer PL.Specifically, the second electrode COM2 is filled into the first contacthole H1 and the second contact hole H2, and thus is electricallyconnected with the first common line COM1. In addition, the secondelectrode COM2 has a third contact hole H3 to expose a portion of thepassivation layer PL. In this embodiment, the second electrode COM2 is acommon electrode, for example. The second electrode COM2 is electricallyconnected to a common voltage Vcom, and the material of the secondelectrode COM2 includes a metal oxide, such as indium tin oxide, indiumzinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germaniumzinc oxide, or other suitable oxides, or a stack layer of at least twoof the aforesaid materials.

It should be noted that, in this embodiment, the second electrode COM2is electrically connected to the common line COM1 through a plurality ofthe first contact holes H1 and a plurality of the second contact holesH2 (see FIG. 2 for the distribution of the second contact holes H2). Inthis way, stability of the common voltage among the pixel structures inthe liquid crystal display panel 100 is able to be improved, andflickers and image sticking in a display image may be prevented.

The first insulation layer IL1 is located on the passivation layer PL.Specifically, the first insulation layer IL1 is filled into the thirdcontact hole H3 and covers the second electrode COM2. In thisembodiment, since the first contact hole H1 has a large opening, whenthe first insulation layer IL1 is formed on the passivation layer PL,the first insulation layer IL1 is conformally formed in the firstcontact hole H1 and the second contact hole H2. Therefore, a portion ofthe first insulation layer IL1 overlapped with the first contact hole H1and the second contact hole H2 has a concave C forming an unevensurface. It should be noted that the uneven surface caused by theconcave C makes the pattern of the first electrode PE desired to beformed subsequently on the first insulation layer IL1 unable to becompletely defined, and the liquid crystal efficiency is thuscompromised. Further details in this regard will be describedsubsequently. In an example, the thickness of the first insulation layerIL is from 0.15 μm to 0.20 μm, and preferably 0.16 μm.

The first electrode PE is located on the first insulation layer IL1 andis electrically connected with the active device T. Specifically, thefirst electrode PE is electrically connected with the drain DE of theactive device T through a fourth contact hole H4. In addition, the firstinsulation layer IL1 the passivation layer PL and the insulation layerPV share the fourth contact hole H4. It should be noted that the fourthcontact hole H4 and the third contact hole H3 are overlapped with eachother, and the opening of the third contact hole H3 is larger than theopening of the fourth contact hole H4. In this way, the first insulationlayer IL1 filled into the third contact hole H3 is capable of preventingthe second electrode COM2 from contacting the first electrode PE, so asto prevent a short circuit. In this embodiment, the first electrode PEis a transparent conductive layer, for example, and includes a metaloxide, such as indium tin oxide, indium zinc oxide, aluminum tin oxide,aluminum zinc oxide, indium germanium zinc oxide, or other suitableoxides, or a stack layer of at least two of the aforesaid materials.

The first electrode PE has a main portion 210 and a plurality of stripportions 220. In addition, a gap SP is formed between two adjacent stripportions 220. More specifically, each of the strip portions 220 has aconnection portion 222, at least one turning point 224, and an extendingportion 226. In addition, the turning point 224 is located between theconnection portion 222 and the extending portion 226, and eachconnection portion 222 directly contacts and connects the main portion210. Besides, the connection portion 222 and the extending portion 226of each of the strip portions 220 form an obtuse angle θ ranging from135 degrees to 160 degrees.

In this embodiment, by configuring each the strip portion 220 with theturning point 224 to provide the obtuse angle θ between the connectionportion 222 and the extending portion 226, the viscous liquid crystalmolecules in the liquid crystal medium 130 are able to be arrangedorderly in an area near the turning point 224, thereby preventingdistribution of the liquid crystal medium 130 from being disordered. Itshould be noted that although disposing the turning points 224 preventsthe disordered distribution of the liquid crystal molecules, anelectrode structure in an area near the connection portion 222 makes thearrangement of the liquid crystal molecules less regular. Therefore,compared with liquid crystal efficiency in an area corresponding to theextending portions 226, the liquid crystal medium 130 in an areacorresponding to the connection portions 222 is unable to be usedeffectively, making the liquid crystal efficiency less preferable.

In this embodiment, the connection portions 222 are substantiallyparallel to each other, the extending portions 226 are substantiallyparallel to each other, and a pitch P2 between two adjacent connectionportions 222 may be equal to a pitch P1 between two adjacent extendingportions 226. In an example, the pitch P1 and the pitch P2 are both 3μm.

In this embodiment, the first contact hole H1 is overlapped with aportion of the first electrode PE. In other words, the portion of thefirst electrode PE is formed on the uneven surface having the concave C.Specifically, as shown in FIG. 3A, the first contact hole H1 isoverlapped with at least one connection portion 222. Although FIG. 3Aillustrates that the first contact hole H1 is overlapped with twoconnection portions 222, the invention is not limited thereto. Theinvention applies as long as the first contact hole H1 is overlappedwith one of the connection portions 222.

More specifically, the first contact hole H1 is overlapped with an areabetween a connection line L of the turning points 224 and the mainportion 210. Besides, on a vertical projection plane, the connectionline L of the turning points 224 is aligned with the first contact holeH1. Namely, on the vertical projection plane, a shortest distancebetween the connection line L of the turning points 224 and the firstcontact hole H1 is 0 μm, indicating that the first contact hole H1 isnot overlapped with the extending portions 226 at all, and the extendingportions 226 are not formed on the uneven surface having the concave C.In this way, the extending portions 226 formed on a relatively flatsurface is able to keep the desired pattern, so as to ensure that anarea corresponding to the extending portions 226 has the preferableliquid crystal efficiency. On the contrary, the connection portions 222formed on the uneven surface having the concave C tend to have the issueof being unable to be completely defined and unable to have the desiredpattern, making a direction of the liquid crystal medium 130 in the areacorresponding to the connection portions 222 disordered and thusreducing the liquid crystal efficiency.

Furthermore, since the arrangement of the liquid crystal molecules inthe area near the connection portions 222 is less ordered, throughdisposing the first contact hole H1 at the position not overlapped withthe extending portions 226 at all but only overlapped with theconnection portions 222, the position where the arrangement of liquidcrystal molecules are less ordered and its influencing factor arecompletely restrained in an area below the connection line L. Thus, theliquid crystal medium 130 is used effectively and the area correspondingto the extending portions 226 where the preferable liquid crystalefficiency still maintains the preferable liquid crystal efficiency.Consequently, the pixel structure 200 a still has the desired liquidcrystal efficiency and a desired transmittance rate.

Also, in this embodiment, while there is no pitch between the connectionline L of the turning points 224 and the first contact hole H1 on thevertical projection plane, i.e., the shortest distance therebetween is 0μm, the invention is not limited thereto. In other embodiments, on thevertical projection plane, there may be a pitch between the connectionline L of the turning points 224 and the first contact hole H1, and theshortest distance therebetween is greater than 0 μm and shorter than orequal to 2 μm.

In addition, the configuration of the first electrode PE of theembodiment is not limited to the configuration shown in FIG. 3A. Inother words, as long as each of the strip portions 220 has theconnection portion 222, at least one turning point 224, and theextending portion 226, the first electrode PE may be an electrode in anarbitrary configuration in the conventional fringe field switchingliquid crystal display panel. For example, while it is illustrated inFIG. 3A that the extending portion 226 is in a straight-line shape, theextending portion 226 may also be in a “<<” shape in other embodiments.

Besides, although the number of the strip portions 220 in the firstelectrode PE shown in FIG. 3A is three, the invention is not limitedthereto. In other embodiment, the number of the strip portions 220 maybe adjusted based on the practical needs of the display panel.

Moreover, in this embodiment, by electrically connecting the firstelectrode PE and the active device T and electrically connecting thesecond electrode COM2 and the common line COM1 to provide the commonvoltage Vcom, a voltage difference between the first electrode PE andthe second electrode COM2 is generated. Thus, a fringe field is formedto drive the liquid crystal medium 130 to incline toward a direction ofthe electrical field to achieve a displaying effect. Nevertheless, theinvention is not limited thereto. In other embodiments, the firstelectrode PE may be electrically connected with the common voltage Vcom,and the second electrode COM2 may be electrically connected with theactive device T, as long as the voltage difference between the firstelectrode PE and the second electrode COM2 is provided to form thefringe field.

Then, the pixel structure 200 b is described in FIGS. 4A, and 4B. Asshown in FIGS. 2, 4A to 4B and 3A to 3B, it can be known that the pixelstructure 200 b is similar to the pixel structure 200 a. Thus, same orsimilar elements are represented by same or similar symbols, and nofurther details in this respect will be reiterated below.

Specifically, the pixel structure 200 b differs from the pixel structure200 a in that in the pixel structure 200 b, the second insulation layerIL2 formed by the gate insulation layer GI and the insulation layer PVdoes not have the contact hole H2, and the passivation layer PL does nothave the first contact hole H1. In other words, in the pixel structure200 b, the second electrode COM2 and the common line COM1 are notelectrically connected to each other through the first contact hole H1and the second contact hole H2.

It should be noted that compared with the pixel structure 200 b, eventhough the uneven surface caused by the concave C reduces the liquidcrystal efficiency and the transmittance rate of the pixel structure 200a, the liquid crystal display panel 100 still has the preferable displayquality for the following reasons. Generally speaking, when a differencein transmittance rate between two pixel structures is greater than 9%,dot mura in an image may occur. However, in this embodiment, the firstcontact hole H1 is disposed at the position that is not overlapped withthe extending portions 226 but only overlapped with the connectionportions 222. Therefore, the uneven surface having the concave C onlyinfluences the area corresponding to the connection portions 222 havingthe less preferable liquid crystal efficiency, and the areacorresponding to the extending portions 226 having the preferable liquidcrystal efficiency is not influenced. Thus, the pixel structure 200 a isable to maintain the desired liquid crystal efficiency and the desiredtransmittance rate, such that the difference in transmittance ratebetween the pixel structure 200 a and the pixel structure 200 b is keptto be lower than 9% (lower than 2%, for example) to prevent dot mura inthe image.

In addition, as shown in FIG. 2, the pixel structures 200 a includingthe second contact hole H2 are randomly distributed and are arrangedinto lines and columns with the pixel structures 200 b. In other words,in this embodiment, the second electrode COM2 is electrically connectedto the common line COM1 through the randomly disposed second contacthole H2 and the first contact hole H1.

Based on the embodiment, it can be known that in the liquid crystaldisplay panel 100, by disposing the first contact hole H1 and the secondcontact hole H2 in the pixel structure 200 a and making the firstcontact hole H1 located at the position that is overlapped with at leastone connection portion 222 or overlapped with the area between theconnection line L of the turning points 224 and the main portion 210,not only the second electrode COM2 is able to be electrically connectedto the common line COM 1 to improve the stability of the common voltageof the liquid crystal display panel 100, thereby preventing flickers andimage sticking in the display image, the pixel structure 200 a is alsomaintained with the desired liquid crystal efficiency and thetransmittance rate, so as to prevent the dot mura in the display imageresulted from the the difference in transmittance rate greater than 9%between the pixel structures 200 a and 200 b.

In addition, in FIG. 3A, although the pitch P2 between two adjacentconnection portions 222 in the pixel structure 200 a is equivalent tothe pitch P1 between two adjacent extending portions 226, the inventionis not limited thereto. In other embodiments, to allow the connectionportion overlapped with the first contact hole to be completely definedand thus has the desired pattern, the pitch between two adjacentconnection parts may be adjusted. In the following, details in thisrespect will be described with reference to FIG. 5.

FIG. 5 is a schematic top view illustrating a pixel structure accordingto another embodiment of the invention. Referring to FIGS. 3A and 5together, a pixel structure 200 a′ in FIG. 5 is similar to the pixelstructure 200 a of FIG. 3A. Therefore, same or similar elements arereferred to by same or similar symbols, and details in this respect willnot be reiterated below.

Based on FIGS. 3A and 5, it can be known that the pixel structures 200a′ and 200 a mainly differ in that in the pixel structure 200 a′ a pitchP2′ between connection portions 222′ of two adjacent strip portions 220is greater than the pitch P1 between the extending portions 226.Specifically, in this embodiment, the pitch P2′ is configured to begreater than the pitch P1 by making a line width W2 of the connectionportion 222′ smaller than a line width W1 of the extending portion 226.In an example, the pitch P2′ is 4 μM and the pitch P1 is 3 μm, forexample.

It should be noted that in the pixel structure 200 a′ shown in FIG. 5,the pitch P2′ is greater than the pitch P1. Therefore, even though thefirst contact hole H1 is still overlapped with at least one connectionportion 222′ to make the connection portion 222′ form on the unevensurface, the connection portion 222′ is still able to be completelydefined and thus has the desired pattern. In other words, in thisembodiment, by adjusting the pitch P2′ between two adjacent connectionportions 222′ to accommodate a limitation on manufacturing capability,the pattern of the connection portions 222′ may be defined completely.Thus, the influence of the contact hole H1 on the liquid crystalefficiency and the transmittance rate of the pixel structure 200 a′ maybe reduced, thereby preventing dot mura in the display image.

In addition, with the illustration of FIGS. 1 to 4B, people havingordinary skills in the art shall understand that the pixel array 114 inthe liquid crystal display panel 100 may also be realized the pixelstructure 200 a′ shown in FIG. 5 and the pixel structure 200 b shown inFIGS. 4A to 4B. By disposing the first contact hole H1 and the secondcontact hole H2 in the pixel structure 200 a′, making the first contacthole H1 located at the position that is overlapped with at least oneconnection portion 222′ or overlapped with the area between theconnection line L of the turning points 224 and the main portion 210,and setting the pitch P2′ to be greater than the pitch P1, not only asecond electrode COM2′ is electrically connected to the common line COM1to improve the stability of the common voltage of the liquid crystaldisplay panel 100, thereby avoid flickers and image sticking in thedisplay image, the pixel structure 200 a′ is also maintained with thedesired liquid crystal efficiency and the desired transmittance rate, soas to prevent the dot mura in the display image resulted from thedifference in transmittance rate greater than 9% between the pixelstructures 200 a′ and 200 b.

Besides, in FIGS. 3A and 3B, although the first contact hole H1 and thesecond contact hole H2 are overlapped, the invention is not limitedthereto. In other embodiments, to allow the second electrode to beelectrically connected to the common line, the first contact hole andthe second contact hole may not be overlapped with each other. In thefollowing, details in this respect will be described with reference toFIGS. 6A and 6B.

FIG. 6A is a schematic top view illustrating a pixel structure accordingto another embodiment of the invention. FIG. 6B is a schematiccross-sectional view along cross-sectional lines I-I′ and II-IP of FIG.6A. Referring to FIGS. 3A and 6A together, a pixel structure 200 a″ inFIG. 6A is similar to the pixel structure 200 a of FIG. 3A. Therefore,same or similar elements are referred to by same or similar symbols, anddetails in this respect will not be reiterated below.

Based on FIGS. 3A to 3B and 6A to 6B, it can be known that the pixelstructures 200 a″ and 200 a mainly differ in that in the pixel structure200 a″, a first contact hole H1″ and a second contact hole H2″ are notoverlapped with each other, while in the pixel structure 200 a, thefirst contact hole H1 and the second contact hole H2 are overlapped witheach other.

Specifically, in this embodiment, the pixel structure 200 a″ furtherincludes a conductive layer M to electrically connect a second electrodeCOM2″ and the common line COM1. In addition, the conductive layer M islocated on the passivation layer PV and filled into the second contacthole H2″ to be electrically connected with the common line COM1, whilethe second electrode COM2″ is only filled into the first contact holeH1″ to be electrically connected with the conductive layer M. In otherwords, in the pixel structure 200 a″, the second electrode COM2″ iselectrically connected to the common line COM1 through the first contacthole H1″, the conductive layer M, and the second contact hole H2″.

It should be noted that even though a first insulation layer IL1″ isconformally filled into the first contact hole H1″ having a greateropening to form an uneven surface having a concave C″ at a portion ofthe first insulation layer IL1″ overlapped with the first contact holeH1″, the uneven surface having the concave C″ only influence the areacorresponding to the connection portions 222 having the less preferableliquid crystal efficiency, and the area corresponding to the extendingportions 226 having the preferable liquid crystal efficiency is notinfluenced, because the first contact hole H1″ is disposed at a positionthat is only overlapped with the connection portions 222 and is notoverlapped with the extending portions 226. Thus, the desired liquidcrystal efficiency and the desired transmittance rate of the pixelstructure 200 a″ are still maintained.

In addition, with the illustration of FIGS. 1 to 5, people havingordinary skills in the art shall understand that the pixel array 114 inthe liquid crystal display panel 100 may also be realized with the pixelstructure 200 a″ shown in FIGS. 6A and 6B and the pixel structure 200 bshown in FIGS. 4A to 4B. By disposing the first contact hole H1″, theconductive layer M, and the second contact hole H2″ in the pixelstructure 200 a″, and making the first contact hole H1″ located at theposition that is overlapped with at least one connection portion 222 oroverlapped with the area between the connection line L of the turningpoints 224 and the main portion 210, not only the second electrode COM2″is electrically connected to the common line COM1 to improve thestability of the common voltage of the liquid crystal display panel 100,thereby avoid flickers and image sticking in the display image, thepixel structure 200 a″ is also maintained with the desired liquidcrystal efficiency and the desired transmittance rate, so as to preventthe dot mura in the display image resulted from the difference intransmittance rate greater than 9% between the pixel structures 200 a″and 200 b.

In view of the foregoing, in the liquid crystal display panel of theinvention, the first contact hole overlapped with at least oneconnection portion or overlapped with the area between the connectionline of the turning points and the main portion is disposed in some ofthe pixel structures to electrically connect the second electrode andthe common line. With such configuration, the stability of the commonvoltage is improved to prevent flickers and image sticking in thedisplay image, and the pixel structures are maintained with the desiredliquid crystal efficiency and the desired transmittance rate to preventdot mura in the display image.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentinvention without departing from the scope or spirit of the invention.In view of the foregoing, it is intended that the present inventioncover modifications and variations of this invention provided they fallwithin the scope of the following claims and their equivalents.

1. A liquid crystal display panel, comprising: an array substrate,comprising: a passivation layer, having a first contact hole; a firstinsulation layer, located on the passivation layer, wherein the firstinsulation layer has a concave at a portion overlapped with the firstcontact hole; and a first electrode, located on the passivation layerand the first insulation layer, the first electrode having: a mainportion; and a plurality of strip portions, wherein a gap is formedbetween two adjacent strip portions, each of the strip portions has aconnection portion, at least one turning point, and an portion, theturning point is located between the connection portion and theextending portion, each of the connection portions is directly connectedwith the main portion, and the first contact hole is overlapped with atleast one connection portion; an opposite substrate, disposed oppositeto the array substrate; and a liquid crystal medium, disposed betweenthe array substrate and the opposite substrate.
 2. The liquid crystaldisplay panel as claimed in claim 1, wherein an area between aconnection line of the turning points of the strip portions and the mainportion is overlapped with the first contact hole.
 3. The liquid crystaldisplay panel as claimed in claim 1, wherein on a vertical projectionplane, a shortest distance from a connection line of the turning pointsof the strip portions to the first contact hole is from 0 μm to 2 μm. 4.The liquid crystal display panel as claimed in claim 1, wherein thearray substrate further comprises: a scan line and a data line; anactive device, electrically connected with the scan line and the dataline; and a second electrode, wherein the first electrode is locatedabove the second electrode, the first insulation layer is locatedbetween the first electrode and the second electrode, and one of thefirst electrode and the second electrode is electrically connected withthe active device.
 5. The liquid crystal display panel as claimed inclaim 1, wherein the array substrate further comprises a secondinsulation layer located below the passivation layer, and the secondinsulation layer has a second contact hole.
 6. The liquid crystaldisplay panel as claimed in claim 5, wherein the first contact hole andthe second contact hole are overlapped with each other.
 7. The liquidcrystal display panel as claimed in claim 6, wherein the first contacthole and the second contact hole are in a concentric arrangement.
 8. Theliquid crystal display panel as claimed in claim 5, wherein the firstcontact hole and the second contact hole are not overlapped with eachother.
 9. The liquid crystal display panel as claimed in claim 5,wherein the array substrate further comprises a common line, the secondelectrode is electrically connected with the common line through thefirst contact hole and the second contact hole.
 10. The liquid crystaldisplay panel as claimed in claim 9, wherein a material of the commonline comprises metal.
 11. The liquid crystal display panel as claimed inclaim 1, wherein the connection portion and the extending portion ofeach of the strip portions thin′ an obtuse angle ranging from 135degrees to 160 degrees.
 12. The liquid crystal display panel as claimedin claim 1, wherein each of the extending portions is not overlappedwith the first contact hole.
 13. The liquid crystal display panel asclaimed in claim 1, wherein a pitch between the connection portions oftwo adjacent strip portions is greater than a pitch between theextending portions.
 14. The liquid crystal display panel as claimed inclaim 1, wherein a thickness of the passivation layer ranges from 1.3 μmto 3 μm.
 15. A liquid crystal display panel, comprising: an arraysubstrate, comprising: a passivation layer, having a first contact hole;a first insulation layer, located on the passivation layer; and a firstelectrode, located on the passivation layer and the first insulationlayer, the first electrode having: a main portion; and a plurality ofstrip portions, wherein a gap is formed between two adjacent stripportions, each of the strip portions has a turning point, and an areabetween a connection line of the turning points of the strip portionsand the main portion is overlapped with the first contact hole; anopposite substrate, disposed opposite to the array substrate; and aliquid crystal medium, disposed between the array substrate and theopposite substrate.
 16. The liquid crystal display panel as claimed inclaim 15, wherein on a vertical projection plane, a shortest distancefrom the connection line of the turning points of the strip portions tothe first contact hole is from 0 μm to 2 μm.
 17. The liquid crystaldisplay panel as claimed in claim 15, wherein the array substratefurther comprises a second insulation layer located below thepassivation layer, and the second insulation layer has a second contacthole.